Pixlane / Blog / JPG vs PNG vs WebP
JPG vs PNG vs WebP: Which Image Format Should You Use?
Updated April 2025 · 6 min read
You save an image and face three options: JPG, PNG, WebP. Each is widely used — but choosing the wrong one results in unnecessarily large files, broken transparency, or images that refuse to open on certain devices. This guide explains the real differences so you can pick the right format every time.
The Short Answer
- JPG — best for photos, everything that has continuous color gradients. Maximum compatibility.
- PNG — best for logos, icons, screenshots, and anything with transparency.
- WebP — best for websites. Smaller than both JPG and PNG, supports transparency, but compatibility is limited in older apps and print workflows.
How Each Format Works
JPG (JPEG)
JPG uses lossy compression. When you save a JPG, the algorithm discards color data that the human eye is least likely to notice — typically fine texture in smooth gradients and subtle color transitions. The result is a much smaller file, but some image information is permanently lost.
Key characteristics:
- Lossy compression (quality degrades with each re-save)
- No transparency support — transparent areas become white or black
- Best for photos, gradients, natural images
- Universal compatibility — every device, app, and browser since 1992
- Typical sizes: 100–500 KB for a standard photo at good quality
PNG
PNG uses lossless compression. No image data is discarded — the exact pixel values are preserved. This makes PNG ideal for graphics where precision matters: logos with crisp edges, text, icons, and screenshots.
Key characteristics:
- Lossless — quality never degrades regardless of how many times you save
- Full alpha channel transparency support (including semi-transparent pixels)
- Best for logos, icons, illustrations, screenshots, graphics with text
- Near-universal compatibility — supported everywhere JPG is supported
- Larger files than JPG for photos (3–5× larger is common)
WebP
WebP was developed by Google and released in 2010. It supports both lossy and lossless compression and includes alpha channel transparency. The key advantage: it achieves significantly smaller file sizes than JPG or PNG at comparable quality.
Key characteristics:
- Supports both lossy (like JPG) and lossless (like PNG) modes
- Supports transparency in both modes
- 25–35% smaller than JPG at the same visual quality
- Supported in all modern browsers (Chrome, Firefox, Safari 14+, Edge)
- Limited support in older apps, print services, Photoshop (without plugins), email clients, and many mobile apps
Side-by-Side Comparison
| JPG | PNG | WebP | |
|---|---|---|---|
| Compression | Lossy | Lossless | Both |
| Transparency | No | Yes | Yes |
| File size (photos) | Medium | Large | Small |
| App compatibility | Universal | Very wide | Modern only |
| Best for | Photos | Logos, icons | Web images |
| Print support | Yes | Yes | Limited |
When to Use Each Format
Use JPG when:
- You are saving or sharing a photograph
- You need the image to work in every app, including old ones
- You are sending files via email or to a print service
- File size matters and you do not need transparency
Use PNG when:
- Your image has a transparent background (logos, icons, stickers)
- You are saving a screenshot or UI graphic where text must be sharp
- You are editing the same image repeatedly and need to preserve quality between saves
- You need to overlay an image on different backgrounds
Use WebP when:
- You are optimizing images for a website or web app
- Page load speed and Core Web Vitals matter to you
- Your audience uses modern browsers (Chrome, Firefox, Safari 14+, Edge)
- You want transparency and smaller file sizes than PNG
Frequently Asked Questions
Does converting JPG to PNG improve quality?
No. Converting a JPG to PNG does not recover quality lost during JPG compression. The PNG will be a lossless copy of the already-compressed JPG. Quality can only be preserved by starting from the original uncompressed source image.
Is WebP replacing JPG?
On the web, WebP has largely replaced JPG for new content — most CDNs and image optimization services serve WebP automatically when the browser supports it. But for offline use, email, print, and sharing across platforms, JPG remains dominant because of its universal compatibility.
What about AVIF and HEIC?
AVIF is a newer format that beats WebP on compression efficiency and is gaining browser support. HEIC is Apple's iPhone format — extremely space-efficient but with very limited cross-platform support. For most practical use, stick with JPG, PNG, or WebP.
Convert Between Formats on Pixlane
- Convert JPG to PNG — add transparency support to a photo
- Convert PNG to JPG — reduce file size when transparency is not needed
- Convert WebP to JPG — make a WebP file compatible with all apps
- Convert Image — convert between any two formats including AVIF, HEIC, BMP, TIFF